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[OP]

Originally Posted by SSR_2SM

Thank you for your response. When I first started having problems, the volt meter fluctuated between 12 & 14.5 regularly. I even took some digital photos to show the dealer. They, too, kind of shined it on saying that there were no problems with the vehicle, while generously throwing the "A-word" (Aftermarket) around implying that the 5120 is the problem. I have not seen the volt meter dip below 13 in 6-weeks or so. Let's hope one of us can get to the bottom of this soon! I will keep everyone posted on my progress (or lack thereof).

It is COMMON for the voltmeter to fluctuate as you describe. Mine has done it since new and they even changed the meter under warranty to make sure. Chevy says it is normal operation, as components pull load,. I will say that my new one (now has 38000 miles on it) does not jump around as much and even less since I changed batteries and ignition switch.